Air-supplying means for stokers



Sept. 5, 1939.

E. L. ZEHRBACH AIR-SUPPLYING MEANS FOR STOKERS Filed July 15, 1936 2 Sheets-Sheet 1 3 EqgwlflZehrbadz Patented Sept. 5, 1939 UNITED STATES PATENT OFFICE 2,111,951: I am-snmmo mans ron. s-

as": n Zehrbach, mo", om Application July 15, me. Serial No. mm

' 3 Claims. (oi.- HHS) This invention aims to provide a novel means whereby, without drilling, and by a simple punching or knock-out process, an additional air supply may be aflorded through the tuyeres and the 5 dead plates of a mechanicalstoker.

It is within the province of the disclosure to improve generally and to enhance the utility of deuices of thattype to which the invention appertains.

10 with the above and other objects in view,

which will appear as' the description proceeds,

the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it

15 being understood that changes in the precise embodiment of the invention herein disclosed,

may be made within the scope of what is claimed,

without departing from the spirit of the invention. 2o In' the accompanying drawings:

Fig. 1 shows, in vertical section, a portion oi a stoker equipped with the device forming the sub- .iect matter of this application;

-' Fig. 2 is a side elevation showing one the gs tuyere members;

Fig. 3 is an elevation showing the inner side of the tuyre member;

Fig. 4 is an elevation showing the outer side of the tuyere member; 30 Fig. 5 is a top plan of the tuyere member; and Fig. 6 is a horizontal section of the structure delineated in Fig. 1, most parts appearing in top plan. 4

The numeral I marks a casing, which may be 35 01 any desired size and shape, the casing constituting part of a mechanical stoker. .The casing i is the combustion chamber lining, usually made of fire brick for insulating and more complete combustion purposes. Dead plates 3 are 0 supported on the casing I. Fuel is fed through a conduit 4, by a conveyor 53 The conduit 4 has an upwardly extended mouth 8 which constitutes the base of a retort At its upper end, the base por-, tion 6 of the retort has an outstanding rim l.-

s A chamber 8 exists in the casing I. about the base 6 of the retort, and into this chamber, air is forced under pressure, by any suitable means, not shown in the drawings, and constituting no part of the present invention.

so The upper member of the retort is marked by the numeral 9, and is composed of a plurality of tuyeres iii, located side by side. Each tuyere II comprises an outer wall II, at the upper end of which there is a head i2, connected to a deit pending inner wall it, the inner wall it being Joined, intermediateits side edges, to the outer wall ii, by a vertical web II, extended upwardly to the head II. The web ll i'orms vertical air I channels 20 on each side of the web I! of each tuyere, and. therefore, between the webs of ad- 5 loining'tuyeres. At the lower end of the inner wall it or the tuyere there is a law." which receives the rim I oi the base 8 01' the retort.

At the lower end of the outer wall ll of each tuyere there is an outstanding lug II. which is 10 engaged beneath the dead plates 3. Along one side 01 the web II, a rib 1' extends between the outer wall ll of the tuyere and the inner wall It thereof. 0n the opposite side of the web IS, a projection is is i'ormedintegrally with the outer wall II and extends between the web Ii and one edge of the wall H, as shown in Fig. 3.

Ducts 2i, oi L-shape, are formed in opposite sides 01' the head ii. The ducts 2i comprise,

each, a horizontal portion 22, opening into the upper member 9 oi' the retort, and a vertical depending portion II, communicating with the corresponding air channel 20. In the outer surface 01' the head i2 (Fig. 4) oppositely disposed notches 24 are formed, and. thesenotches are 25 separated from the horizontal portions 22 of the ducts II by thin breakable fins 25. oppositely disposed openings 26 are formed in opposite edges of the inner wall It, as shown in Fig. 3 and establish communication between the interior of the 30 upper member 9- 01 the retort and the air channels 20. The openings 26 are closed to any desired extent by thin, breakage fins 21, formed integrally with the inner wall it. Slots 28 are formed in the dead plates 3 and are bridged across by thin partitions 29.

Fuel is conveyed item a source of fuel supply, through the conduit I, by the appliance shown at 5, or by an equivalent means. The fuel is i'orce'd upwardly through the retort 6-9. Air is 4 forced through the chamber 8, and through the air channels 2., the air entering the retort by way or L-s'haped ducts ii in the tuyeres. Air also enters the retort through the openings 26,

ii the fins ll are not large enough to close the '45 openings 28 completely. The size and shape of the air openings in the tuyeres III are so de- Mad as to meet firing conditions encountered with the average grade of coal. However, in somecases, where a slowly burning coal is supplied to the stoker, the amount of air passing through the tuyeres III, as above described, is insumcient to consume the fuel entirely, and some of the fuel is deposited on the dead plates 8, in the form of residual coke. In order to consume the residual coke completely, under the conditions mentioned, it is necessary to have an additional air supply through the tuvres Ill, and sometimes through the dead plates 3. This is accomplished by knocking out with a hammer-and punch, as many of the thin, breakable 'fins 25 and 21 as may be required, it being possible, also, to knock holes 30 through the thin partitions 29 in the slots 28 of the dead plates 3.

It is not practical to drill holes, like the holes 30, in the dead plates 3, since this is a tiresome job, owing to the thickness of the dead.plates. The tuyres ll cannot be drilled as above described, because, generally stated, they are inaccessible to a boring tool. When, however, the present invention is put into practice, all that the operator has to do is to knock outwith apunch and hammer, so much oi the partitions 29, and so many of the fins 25 and 21, as may be found expedient.

Having thus described the invention, what is claimed is:

1. In a device of the class described, a tuyere comprising an outer wall, an inner wall, a head joining the walls, and a web connected to the walls and to the head and forming air channels on opposite sides of the web, the head being provided with ducts leading from the air channels to the inner surface of the tuyre, the head being provided on its outer side with openings, and the head being supplied with thin breakable fins having edge connection with the head and interposed between theopenings and the ducts, the fins controlling the passage of air, prior to breaking, and

' afiording air passages of increased size, after breaking.

2. In a device of the class described, a tuyere comprising an outer wall, an inner wall, a head joining the walls, and a web connected to the walls and to the head and forming air channels on opposite sides ofthe web, the inner wall being provided with openings leading from the air channels to the inner surface of the tuyre, the

tuyre being supplied with thin breakable fins, having edge connection with the tuyere, the fins being located in the openings, the fins controlling the passage of air, prior to breaking, and affording air passages of increased size, after breaking.

3. In a device of the class described, a retort comprising a tuyre having an opening for the passage of air, the tuyere being provided with an 1 integral .fin having edge connection with the tuyre and located in the opening and much 

